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This is my first custom subwoofer. I got the idea for my setup from this website: http://www.danmarx.org/audioinnovation/10triple10.html . It seemed like a cool idea and I hadn't seen many triple passive subwoofers so I thought I'd give it a try. Ever since I discovered TC Sounds back in 2007, I knew I wanted build a subwoofer based on their products. So here it is. (1) 15" TC-3000, (2) 15" VMP Passive Radiators, (1) 18" VMP Passive Radiator (I couldn't find another 18" so I jumped at the chance to buy 2 15's from an individual). The enclosure is a 24" cube with double mdf walls. The feet are 3.75"x3.75"x3" made from mdf. You can see the bracing in the first image. A local bedliner shop sprayed the entire enclosure for $40. The trim cherry 4" wide x 3/3 thick, joined at the corners, stained with a satin finish. The top will have 26" granite top by the end of the week. Pioneer~Saturn (member @ caraudioclassifieds.org) built the enclosure seeing that I'm no good at woodworking. After displacement and bracing, volume is 4.8 cuft. There is just over 1500grms of washers (including the nut) on each passive placing tuning at about 18hz. I've only tested it a couple times since it's at work and shakes the walls and drop ceiling in the room. (boss not too happy about that). FYI, anyone needing more washers for TC Sounds VMP's, check out fastenal. They the exact size and weight for $.79 each. Let me know what you think.

I don't know much about the TC line, but the new Audiopulse line by the same company models better than anything I have tried yet, and I've tried everything! In a passive radiator configuration, nothing can beat the amount of low end extention these are capable of in a very small enclosure. These are simply awesome. Too bad there's rumors of the company closing, and you can never reach anyone by phone or email - ever. Getting the VMP passives is about impossible.

EDIT: I went with the 12" rather than the 15" because it models less than 1 dB difference but in a 30% smaller enclosure. The smaller size is just small enough for me to use it absolutely anywhere I could ever want (1.85 cu ft) and it will already be plenty as loud and deep as I will ever want. Since I can't get the VMP Passives, I'm going with the Exodus EX-PR15 passives. They model almost identical as the WMPs. I only need 2 with my plan, so it can be used against a wall. I will wrap a single speaker cloth from one side, around the front, and over the other side. The top and bottom walls will extend to form a rounded lip over the cloth. It will look like an ordinary little speaker - but it ain't ordinary! Did I say I love the way these little monsters model?

TC Sounds=Audiopulse. The Axis is exactly the same as the TC-3000 just painted blue. I've heard they have some new subs coming but I haven't seen them yet. Like you, I love the product. My next project is putting a 12" Titanium TC9+ LMS12 in my car. It's the same as this but 12" with tall surround and 30mm xmax: http://www.parts-express.com/pe/show...number=293-630

Overall, I really like the way it looks. I'm a little concerned about this beast walking across the floor at 20hz though. Maybe it won't be so bad when I put the stone on top.

First of all, I must pause to clean the drool off my keyboard... I ran across some bnib TC-1000 15" from an ex-dealer, and put together a down&dirty sealed containing both (used "cheater's" paint, Rustoleum Stone finish), they sound phenomenal. I hope TC Sounds has "traction" this time around as well.

Nice job maintrain. Excuse my woodworking newbieness: Are the perforated holes in the interior layers to allow the panels to fit flush (glue release)? You are powering this with?

If your TC Sounds 15" is anything like the Audiopulse 15", you could have gone with a much smaller box. At 4.8 cf ft net internal volume, it will be kind of like a 22Hz SPL box. I'm showing 120.5 dB @ 22Hz free air response. That'd be more like 133 dB in-room. A smaller box would have evened out the huge peak at around 22Hz. You can toy with weights to move it around, but the peak is going to be there, even worse as you remove weight. The peak rides down to 118 dB @ 35 Hz free air response, not a horrible peak, but it would be gone with a smaller box, and, well you would have a smaller box. I probably would have gone with 2.5 cu ft net internal volume with that driver.

First of all, I must pause to clean the drool off my keyboard... I ran across some bnib TC-1000 15" from an ex-dealer, and put together a down&dirty sealed containing both (used "cheater's" paint, Rustoleum Stone finish), they sound phenomenal. I hope TC Sounds has "traction" this time around as well.

Nice job maintrain. You are powering this with?

Behringer EP-2500 bridged 4ohms. Also using and Audio Buddy preamp to boost the input signal. 2 15" 1000's sealed sounds really strong. I love the punch you get from a sealed sub.

If your TC Sounds 15" is anything like the Audiopulse 15", you could have gone with a much smaller box. At 4.8 cf ft net internal volume, it will be kind of like a 22Hz SPL box. A smaller box would have evened out the huge peak at around 22Hz. You can toy with weights to move it around, but the peak is going to be there, even worse as you remove weight. I probably would have gone with 2.5 cu ft net internal volume.

I'm using an Antimode 8033 which should smooth out the response. It worked wonders on my previous sub.

So far I'm in awe of how much output I'm getting between 15 and 20hz compared to previous subwoofer (lowly Audiosource SWfifteen). The old one would distort pretty bad when pushed to the limits. The TC's just keep asking for more! I already love it.

I like the build, it looks good and is well braced, which is a good thing. I used the same TC 3k driver and it does perform, specially in the low bass. I first had it in a small 4cf sealed box and then a bigger 7cf with 18" PR's and I can say that not only did it provide more powerful low bass than the sealed box, but was also more linear across the frequency range (the sealed box had a big deep after 60hz or so).

On the webpage in that link in the first post, the author refers to an excel spreadsheet he used to calculate the mass needed for his passives. Maybe it will help someone else who's trying to figure this out.

Nice looking sub! I bet you need to secure it with spikes when really cranking it up. In the Youtube video around the 1:30 mark and after, it looks like the enclosure is really moving when you look at the corner molding.

But like you said, maybe the top will weight it down enough. Either way, good job, it looks great.